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what is the difference between Cpp And Java
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Answer Posted / subramanyam reddy.b
java is 100% pure object language because it supports all the features of oops and also overcome the draw backs of c++. all c++ programs can be written like cc programs, c++ support friend functions to access private data members, it is illegal. tell me why we have to use private key word to provide security for our data, but by using friend functions we can access the private date it is illegal.c++ does not support automatic gorbage collection, even though destructors are exists in c++ we need to write the code for destructors, without writing code it wont work. in java we have gorbage collectors.c++ support only seequential access where as java support concurrent access of data by using multi threading concept.java is used to develop distributed applications but c++ for staand alone applicatiuons............ like this we have many advantages with java
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3.2 Consider the following class: public class Point { protected int x, y; public Point(int xx, int yy) { x = xx; y = yy; } public Point() { this(0, 0); } public int getx() { return x; } public int gety() { return y; } public String toString() { return "("+x+", "+y+")"; } } Say you wanted to define a rectangle class that stored its top left corner and its height and width as fields. 3.2.1 Why would it be wrong to make Rectangle inherit from Point (where in fact it would inherit the x and y coordinates for its top left corner and you could just add the height and width as additional fields)? (1) 8 Now consider the following skeleton of the Rectangle class: public class Rectangle { private Point topLeft; private int height, width; public Rectangle(Point tl, int h, int w) { topLeft = tl; height = h; width = w; } public Rectangle() { this(new Point(), 0, 0); } // methods come here } 3.2.2 Explain the no-argument constructor of the Rectangle class given above. 3.2.3 Write methods for the Rectangle class to do the following: • a toString() method that returns a string of the format "top left = (x, y); height = h; width = w " where x, y, h and w are the appropriate integer values. • an above() method that tests whether one rectangle is completely above another (i.e. all y values of the one rectangle are greater than all y values of the other). For example, with the following declarations Rectangle r1 = new Rectangle(); Rectangle r2 = new Rectangle(new Point(2,2), 1, 4); the expression r2.above(r1) should give true, and r2.above (r2) should give false. (You can assume that the height of a rectangle is never negative.) (2) (5)
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